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From "Colin P. McCabe" <cmcc...@apache.org>
Subject Re: HTrace 4.1 release candidate 2
Date Sat, 20 Feb 2016 01:17:47 GMT
Our compatibility policy (see
http://mail-archives.apache.org/mod_mbox/htrace-dev/201509.mbox/%3C55F8BADC.4050905@oss.nttdata.co.jp%3E
) only covers the htrace-core4 API right now.  So we can guarantee
that any projects using htrace-core 4.0.1 can upgrade to htrace-core
4.1.0 without breaking anything.  (This is a more painful guarantee
than it sounds since it means we can't remove functions, only
deprecate them...  And so forth.)  But it's a very useful guarantee
for our downstream projects.

However, we don't support mixing and matching versions of the
SpanReceiver client and server components.  The admin has to roll out
a uniform version of those components-- for example, using htraced
4.0.1 with htrace-htraced.jar 4.1.0 is not supported.  The rationale
for this limitation is that tracing can simply be disabled for a brief
period during the rolling upgrade process.  Also, the different
SpanReceiver subprojects are at different levels of maturity, and
imposing heavy compatibility guarantees would slow down development
for no real gain.

best,
Colin


On Fri, Feb 19, 2016 at 4:32 PM, Stack <stack@duboce.net> wrote:
> Can a 4.0.1 client talk to a 4.1.0 htrace? Has it been tested?
> St.Ack
>
> On Tue, Feb 9, 2016 at 7:00 PM, Colin P. McCabe <cmccabe@apache.org> wrote:
>
>> Hi all,
>>
>> I've posted the second release candidate for HTrace 4.1 here:
>>
>> http://people.apache.org/~cmccabe/htrace/releases/4.1.0/rc2/
>>
>> The jars have been staged here:
>>
>> https://repository.apache.org/content/repositories/orgapachehtrace-1022
>>
>> Compared to rc1, this rc includes HTRACE-334 and HTRACE-342.
>>
>> HTrace 4.1 brings a lot of robustness improvements.  There were major
>> improvements to htraced and the web UI, as well as new metrics added.
>> There were numerous build fixups, and we added Docker support, to
>> ensure a repeatable build.
>>
>> Check it out.  The vote will run for 5 days.
>>
>> cheers,
>> Colin
>>
>>
>> Release Notes - HTrace - Version 4.1
>> ** Bug
>>     * [HTRACE-114] - Fix compilation error of htrace-hbase against
>> hbase-1.0.0
>>     * [HTRACE-238] - Change maven compiler source level to 1.7 to
>> match targetJdk
>>     * [HTRACE-243] - Remove duplicate maven-assembly-plugin
>> configuration section in htrace-htraced/pom.xml
>>     * [HTRACE-245] - NOTICE.txt: change "developed by The Apache
>> Software...” to "developed at The Apache Software...”
>>     * [HTRACE-246] - HTrace WebApp not properly defined and therefore
>> not packaged into .war
>>     * [HTRACE-248] - HTraced should gracefully shutdown if stopped
>>     * [HTRACE-249] - Script and doc on how to publish website
>>     * [HTRACE-251] - Fix "mvn clean" target
>>     * [HTRACE-253] - Tracer loadSamplers and loadSpanReceivers logs
>> are too chatty
>>     * [HTRACE-256] - Change the artifactId for htrace-core in branch
>> 4.0 to be htrace-core4
>>     * [HTRACE-257] - htrace-htraced: add web symlink rather than
>> generating programmatically
>>     * [HTRACE-262] - Temporarily suppress doclint for Java 8 to
>> prevent build failure
>>     * [HTRACE-266] - Make the CLIENT_REST_MAX_SPANS_AT_A_TIME_KEY
>> config key more consistent with other configs
>>     * [HTRACE-267] - Move owl logo licensing information from NOTICE to
>> LICENSE
>>     * [HTRACE-268] - Remove Units and go-codec from LICENSE since they
>> are not contained in the source release
>>     * [HTRACE-272] - TracerPool must not load multiple inscance of
>> same receiver class when a simple classname is given
>>     * [HTRACE-279] - Fix issues where the HTracedSpanReceiver was
>> using the wrong JSON serialization for spans and add validation to
>> htraced REST ingest path
>>     * [HTRACE-280] - htraced: add metrics about total spans added and
>> dropped per address
>>     * [HTRACE-281] - htraced: add example/htraced-conf.xml
>>     * [HTRACE-282] - htraced: reap spans which are older than a
>> configurable interval
>>     * [HTRACE-283] - Heartbeater should wait for goroutine to finish on
>> close
>>     * [HTRACE-284] - htrace-htraced, htrace-flume: do not treat the
>> shaded version of commons-logging as provided
>>     * [HTRACE-285] - htraced tool: fix query parsing and add query_test
>>     * [HTRACE-289] - Fix TraceEnabled, etc. logger methods for
>> conditional logging
>>     * [HTRACE-294] - htraced: fix some metrics issues
>>     * [HTRACE-297] - htraced: avoid serializing spans to json unless
>> TRACE logging is enabled
>>     * [HTRACE-300] - Reaper should be initialized before shards are
>> activated
>>     * [HTRACE-301] - htraced: fix unit tests that aren't waiting for
>> spans to be written, use semaphore for WrittenSpans
>>     * [HTRACE-302] - htraced: Add admissions control to HRPC to limit
>> the number of incoming messages
>>     * [HTRACE-304] - htraced: fix bug with GREATER_THAN queries
>>     * [HTRACE-307] - htraced: queries sometimes return no results even
>> when many results exist due to confusion in iterator usage
>>     * [HTRACE-311] - htraced: Fix logging to stdout via -Dlog.path=
>>     * [HTRACE-316] - htrace-web: span.js issue: span ID string length
>> is 32, not 36
>>     * [HTRACE-317] - Fix the documentation for adding tracing to an
>> application to reflect HTrace 4.x API changes
>>     * [HTRACE-328] - htraced continues scanning in some cases even
>> when no more results are possible
>>
>> ** Improvement
>>     * [HTRACE-342] - centralize building instructions in BUILDING.txt
>>     * [HTRACE-334] - htrace-web: Make limit of search and children API
>> configurable
>>     * [HTRACE-129] - htraced: add /server/stats REST endpoint
>>     * [HTRACE-156] - HTrace GUI: add about view
>>     * [HTRACE-181] - gui: Split "about" screen
>>     * [HTRACE-237] - Optimize htraced span receiver
>>     * [HTRACE-239] - Add htrace/impl/TestZipkinSpanReceiver.java
>>     * [HTRACE-260] - htrace-zipkin should not set the obsolete
>> duration field in thrift
>>     * [HTRACE-271] - Add log4j.properties to all submodule tests
>>     * [HTRACE-276] - Shade classes into org.apache.htrace.shaded
>> rather than org.apache.htrace
>>     * [HTRACE-286] - htraced: improvements to logging, daemon startup,
>> and configuration
>>     * [HTRACE-290] - htraced: Fix per-faculty log level settings and
>> add unit tests for conditional logging
>>     * [HTRACE-291] - rename bin/htrace to bin/htracedTool
>>     * [HTRACE-292] - "htracedTool version" should display the git
>> hash, and -Dgit.version option should be available for build
>>     * [HTRACE-295] - htraced: setting span.expiry.ms to 0 should
>> disable span expiry
>>     * [HTRACE-296] - htraced tests: make sure local settings for
>> HTRACED_WEB_DIR and HTRACE_CONF_DIR don't affect unit tests
>>     * [HTRACE-298] - htraced: improve datastore serialization and metrics
>>     * [HTRACE-303] - Add client-side htraceDropped log file to track
>> dropped spans
>>     * [HTRACE-305] - htrace-web: Use greater-than-or-equal rather than
>> greater-than in more places
>>     * [HTRACE-306] - htraced: logs should use UTC
>>     * [HTRACE-308] - Deserialize WriteSpans requests incrementally
>> rather than all at once to optimize GC
>>     * [HTRACE-310] - htracedTool: when there is an error response,
>> print the body of the response
>>     * [HTRACE-312] - htraced: if GOMAXPROCS is left at 1, set it to
>> the number of CPUs
>>     * [HTRACE-313] - htraced span receiver clientDropped file should
>> include timestamps
>>     * [HTRACE-314] - htraced: make datastore loading safer
>>     * [HTRACE-327] - HTRACE-327: improve htraced command-line parsing
>> and add version command
>>     * [HTRACE-334] - htrace-web: Make limit of search and children API
>> configurable
>>     * [HTRACE-335] - htrace-web: Adjust size of span widget
>>     * [HTRACE-339] - Major type in htrace-flume README
>>
>> ** New Feature
>>     * [HTRACE-235] - htrace-zipkin - add Kafka transport support
>>     * [HTRACE-277] - htraced: Add /server/conf endpoint to get server
>> configuration
>>     * [HTRACE-278] - htraced: dump thread stacks and GC statistics
>> when SIGQUIT is sent
>>     * [HTRACE-288] - htraced: Add a user interface to view server
>> version, metrics, and configuration
>>     * [HTRACE-293] - htrace-web: control-click should fully expand trace
>> trees
>>     * [HTRACE-299] - htraced: add /server/debugInfo REST endpoint to
>> get stack traces and GC stats
>>     * [HTRACE-309] - htraced: improve leveldb configuration
>>     * [HTRACE-323] - htrace-web: change the cursor to a spinner while
>> a search is in progress
>>     * [HTRACE-332] - htraced: optionally enable leveldb LRU cache
>>
>> ** Task
>>     * [HTRACE-241] - Docker image for HTrace
>>     * [HTRACE-315] - htraced: change default web port from 9095 to 9096
>>     * [HTRACE-319] - mark versions 4.0 and 4.0.1 as released
>>     * [HTRACE-331] - create git tags for 4.0 and 4.0.1 releases
>>
>> ** Wish
>>     * [HTRACE-269] - HTraceConfiguration support to get the map of
>> configurations
>>

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